var arr1 = ['a', 'b', 'c'];
var arr2 = [1, 2, 3];
var arr3 = [true, false, true];
var arr = [];
// => [['a', 1, true], ['b', 2, false], ['c', 3, true]]

[['a', 1, true], []]

// 给 arr 数组追加一个 空的数组，空数组的元素依次循环进去
for (var i = 0; i < arr1.length; i++) {
  arr.push([])
  arr[i].push(arr1[i])
  arr[i].push(arr2[i])
  arr[i].push(arr3[i])
}
 
console.log(arr)